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And chemicals often found in plastics are known to cause a variety of health problems, including cancers, metabolic disorders, attention deficit/hyperactivity disorder, and fertility issues.
It is an important industrial chemical chiefly used to produce the polymer polyvinyl chloride (PVC). Vinyl chloride is a colourless flammable gas that has a sweet odor and is carcinogenic. Vinyl chloride monomer is among the top twenty largest petrochemicals (petroleum-derived chemicals) in world production. [2]
PVC is often used as the insulating sheath on electrical cables. PVC is chosen because of its good electrical insulation, ease of extrusion, and resistance to burn. [40] In a fire, PVC can form hydrogen chloride fumes; the chlorine serves to scavenge free radicals, making PVC-coated wires fire retardant.
Ralph Wiley accidentally discovered polyvinylidene chloride polymer in 1933. [2] At the time he was a college student who worked part-time at Dow Chemical lab as a dishwasher. [3]
THERE ARE A lot of complex scientific topics present in Netflix's 3 Body Problem (presented, believe it or not, in a far more digestible way than the intense concepts presented in author Cixin Liu ...
Vinyl polymers are subject of several structural variations, which greatly expands the range of polymers and their applications. With the exception of polyethylene, vinyl polymers can arise from head-to-tail linking of monomers, head-to-head combined with tail-to-tail, or a mixture of those two patterns. Additionally the substituted carbon center in such polymers is stereogenic (a "chiral center")
Hence, the P-R interval after the PVC is longer than the baseline P-R interval. [ citation needed ] Concealed conduction can be seen in cardiac aberrancy when a bundle branch temporarily blocks due to being refractory, and conduction from the other bundle branch conceals into the blocked branch retrograde thus perpetuation the bundle branch ...
Precipitation of the regenerated PVC compound: the solution of PVC is recovered in a precipitation tank, where steam is injected to evaporate the solvent and precipitate the PVC. The PVC compound is separated in the form of aqueous effluent. [4] [5] and dried. Drying: after recovering the excess water from the slurry, the wet PVC goes to a dryer.